MediaStream API: Do some cleanup in the chromium WebKit API
https://bugs.webkit.org/show_bug.cgi?id=99713

Reviewed by Adam Barth.

Source/Platform:

Removing the deprecated version of WebMediaStreamDescriptor::initialize and making
the two constructSDP functions in WebMediaStreamCenter optional to override.
This is part of the preparation to remove PeerConnection00.

* chromium/public/WebMediaStreamCenter.h:
(WebKit::WebMediaStreamCenter::constructSDP):
* chromium/public/WebMediaStreamDescriptor.h:
(WebMediaStreamDescriptor):

Source/WebCore:

Removing the deprecated version of WebMediaStreamDescriptor::initialize.

No testing needed since only an unused function is removed.

* platform/chromium/support/WebMediaStreamDescriptor.cpp:


git-svn-id: https://svn.webkit.org/repository/webkit/trunk/Source/Platform/chromium/public@131814 268f45cc-cd09-0410-ab3c-d52691b4dbfc